that depends on how much of the work you can do yourself. cutting the axle tubes and rewelding them is fairly easy, if you have a welder and a proper tubing cutter. as for the suspension mounts, if you have a plasma cutter and a welder, you can cut off the old suspension mounts, and weld on the new ones and the cost would be buying the leaf spring mounts, which run about $30 iirc. then the only thin you have to farm out is the axle narrowing, and that depends on the shop labor rates in your area. if you have to have someone do all the work, then figure a minimum of about $700 to have the job done, again depending on labor rates in your area.